Green shop test. What trick question am I missing?

I've only done hundreds of the dang things. I really hate when they don't tell you which questions you've missed. I've gone all through the guidelines and can't figure out what I've missed. I'm at the point where I'm starting to change ones that I'm positive are right, and still can't get a pass. Any suggestions?

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I figure it has to be either the safety/barricade question, the dirt amount question, or the reference object question, but it's still driving me nuts.
If anyone figures it out please post it because I'm going nuts too trying and trying and trying again.
OK, I've tried every possible combination I can think of and I can't figure it out. I'm stopping for tonight.
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